  <% problem_id = "problem_#{@problem.id}" -%>
  <tr id="<%= h problem_id %>" >
    <td>
      <%= link_to @problem.name, @problem %>
    </td>
    <td>
      <%= button_to_remote "Remove",
        :url => {:action => 'remove_problem', :id => @contest.id, :problem_id => @problem.id},
        :update => problem_id %>
    </td>
  </tr>
